b1d39ce291
`SpanHandler` is the base type for the now deprecated `FinishedSpanHandler`.
Notable, it can not just handle things at the end of a recording, but also the
beginning.
For example, this permits set-once baggage without the HTTP abstraction:
```java
static final BaggageField EPOCH_SECONDS = BaggageField.create("epoch_seconds");
static final class RootOnlyBaggage extends SpanHandler {
@Override
public boolean begin(TraceContext context, MutableSpan span, @Nullable TraceContext parent) {
if (EPOCH_SECONDS.getValue(context) == null) { // only set at the first span
long epochSeconds = System.currentTimeMillis() / 1000;
EPOCH_SECONDS.updateValue(context, String.valueOf(epochSeconds));
}
return true;
}
@Override public boolean end(TraceContext context, MutableSpan span, Cause cause) {
Tags.BAGGAGE_FIELD.tag(EPOCH_SECONDS, context, span);
return true;
}
}
```
As the parent is available, it can also facilitate advanced tasks like counting
children, or summarizing entire local roots.
See https://github.com/openzipkin/brave/tree/master/brave/src/test/java/brave/features/handler
and https://github.com/openzipkin/brave/blob/master/brave/src/main/java/brave/handler/SpanHandler.java for more
77 lines
2.4 KiB
XML
77 lines
2.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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~ Copyright 2013-2018 the original author or authors.
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~
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~ Licensed under the Apache License, Version 2.0 (the "License");
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~ you may not use this file except in compliance with the License.
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~ You may obtain a copy of the License at
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~
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~ https://www.apache.org/licenses/LICENSE-2.0
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~
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~ Unless required by applicable law or agreed to in writing, software
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~ distributed under the License is distributed on an "AS IS" BASIS,
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~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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~ See the License for the specific language governing permissions and
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~ limitations under the License.
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-->
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>spring-cloud-sleuth-samples</artifactId>
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<packaging>pom</packaging>
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<name>Spring Cloud Sleuth Samples</name>
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<description>Spring Cloud Sleuth Samples</description>
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<parent>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-sleuth</artifactId>
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<version>2.2.3.BUILD-SNAPSHOT</version>
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<relativePath>..</relativePath>
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</parent>
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<modules>
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<module>spring-cloud-sleuth-sample</module>
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<module>spring-cloud-sleuth-sample-test-core</module>
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<module>spring-cloud-sleuth-sample-messaging</module>
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<module>spring-cloud-sleuth-sample-websocket</module>
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<module>spring-cloud-sleuth-sample-feign</module>
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<module>spring-cloud-sleuth-sample-ribbon</module>
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<module>spring-cloud-sleuth-sample-zipkin</module>
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</modules>
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<build>
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<pluginManagement>
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<plugins>
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<plugin>
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<!--skip deploy (this is just a test module) -->
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<artifactId>maven-deploy-plugin</artifactId>
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<configuration>
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<skip>true</skip>
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</configuration>
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</plugin>
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</plugins>
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</pluginManagement>
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</build>
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<dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-sleuth-dependencies</artifactId>
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<version>${project.version}</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-sleuth-sample-test-core</artifactId>
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<version>${project.version}</version>
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</dependency>
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</dependencies>
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</dependencyManagement>
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</project>
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